Start The Heat Pump With Only Additional Heat; Important Points To Check After Start Up - IVT Greenline HT Plus C Assembly, Commissioning And Maintenance Manual

Start the heat pump with only additional
heat
It might be necessary to run the heat pump before work on the heat
transfer fl uid circuit is complete. You can then start the heat pump with
only additional heat You must have fi lled and vented the heating system to
run the heat pump with only additional heat. Go to the menu display Select
the function only additional heat (menu 5.4) and press the Select button. If
the arrow points towards Normal operation press the Adjust button. Turn
the menu dial until the arrow points towards Only add. heat. Now press the
Save button. This function ensures that additional heat heats both the hot
water and the heating water.

Important points to check after start up

In the fi rst period after commissioning particular attention should be paid
to the pressure and levels in the heat distribution and heat transfer fl uid
circuits. After a short period of operation it may be necessary to top up the
heat transfer fl uid.
On delivery the motor cut-out setting is determined by a value produced
during hot water charging and a stable voltage. The recommended motor
cut-out setting may not always be suitable as the voltage in the mains
can fl uctuate. The setting may therefore, from case to case, need to be
adjusted. Adjust the setting using a clip-on ammeter when the heat pump is
producing hot water. Set the motor cut-out 10% above the highest measured
value on the clip-on ammeter.
For the heat pump to perform at its best, it is important to check the fl ow
on the hot side of the heat pump. Usually, the heat carrier pump has a
speed selector switch. This must be set correctly for the pressure drop in
the systems. A recommended temperature difference over the heat pump
on the hot side is between 7-10 °C and on the cold side between 2-4 °C.
You check this by going to menu display 3 and reading the sensors T8
(GT8) and T9 (GT9) as well as T10 (GT10) and T11 (GT11).
It is important in systems with a bypass that the fl ow in the heating system
exceeds the fl ow over the heat pump. If this is not the case, the heat pump
fl ow goes back via the bypass to the heat pump return, which may cause
the heat pump to give an alarm for a high return temperature. The fl ow
over the heating system should be so great that the entire radiator surface
is kept warm. In this way the heat emitting surface increases and in doing
so the fl ow temperature from the heat pump is kept down.
The heating system should be vented once again after test operations and
then fi lled with cold water if necessary.
Do not forget to return this function to
normal mode.
67
Commissioning the heat pump
Commiss./Service
Select function
only add. heat 5.4
Return Select
Note
Setting motor cutout